How to write the nodevalue back to xml file?

Question

Hi, Everybody:
These are two packages I used. javax.xml.parsers.*,org.w3c.dom.*
Now I use "setNodeValue("abc") to set the node value to "abc". But it is not really saved back into XML file. It only change the node value in memory.
How to write the changes back to XML file? Thank you very much for your help.
Michelle

Answer 1

* Version : 1.00
* File Purpose : Given the xml file loads into dom and recreate the file with the updated values.
* Developer : Kashif Qasim : 25/july/04
* Modify detail :
import java.lang.*;
import java.io.*;
import java.util.*;
import java.text.*;
import org.w3c.dom.*;
import org.apache.xerces.parsers.DOMParser;
import org.apache.xerces.*;
public class XMLWriter
private String displayStrings[] = new String[5000];
private int numberDisplayLines = 0;
private Document document;
//private final Node c;
public synchronized void displayDocument(String uri,Vector UpdatedValues,String getTaskID)
try {
DOMParser parser = new DOMParser();
parser.parse(uri);
document = parser.getDocument();
display(document, "",UpdatedValues);
} catch (Exception e) {
e.printStackTrace(System.err);
ReadXmlConfig objReadXmlConfig = null;
FileWriter filewriter = null;
try {
filewriter = new FileWriter(uri);
for(int loopIndex = 0; loopIndex < numberDisplayLines; loopIndex++){
filewriter.write(displayStrings[loopIndex].toCharArray());
//System.out.println("displayStrings[loopIndex].toCharArray() "+displayStrings[loopIndex].toString());
//filewriter.write("\n");
filewriter.close();
System.gc();
objReadXmlConfig = new ReadXmlConfig();
objReadXmlConfig.ITSLog("File updated for "+getTaskID+" succesfully, file is closed now ");
} catch (IOException e) {
System.err.println("Caught IOException: " + e.getMessage());
objReadXmlConfig = new ReadXmlConfig();
objReadXmlConfig.ITSErrorLog("File updated FAILED for "+getTaskID+". Reason for file error "+e.toString());
}finally {
if (filewriter != null) {
System.out.println("Closing File");
objReadXmlConfig =null;
try{
filewriter.close();
}catch(IOException e){
System.err.println("Caught IOException: " + e.getMessage());
} else {
System.out.println("File not open");
private void display(Node node, String indent, Vector UpdtRecs)
if (node == null) {
return;
int type = node.getNodeType();
NodeList nodeList = document.getElementsByTagName("QueryParm");
int TotalRecs = UpdtRecs.size();
switch (type) {
case Node.DOCUMENT_NODE: {
displayStrings[numberDisplayLines] = indent;
displayStrings[numberDisplayLines] +=
"<?xml version=\"1.0\" encoding=\""+
"UTF-8" + "\"?>";
numberDisplayLines++;
displayStrings[numberDisplayLines] += "\n";
display(((Document)node).getDocumentElement(), "",UpdtRecs);
break;
case Node.ELEMENT_NODE: {
if(node.getNodeName().equals("QueryParm")) {
for(int i =0 ; i< nodeList.getLength() ; i++)
Node nodeQry = nodeList.item(i);
NamedNodeMap nnp = nodeQry.getAttributes();
for(int j= 0 ; j < nnp.getLength() ; j++)
Attr atr = (Attr) nnp.item(j);
if(atr.getName().equalsIgnoreCase("value_"+(i+1)))
//System.out.println(atr.getName() +" : " + atr.getNodeValue() );
atr.setNodeValue(UpdtRecs.get(i).toString());
displayStrings[numberDisplayLines] = indent;
displayStrings[numberDisplayLines] += "<";
displayStrings[numberDisplayLines] += node.getNodeName();
int length = (node.getAttributes() != null) ?
node.getAttributes().getLength() : 0;
Attr attributes[] = new Attr[length];
for (int loopIndex = 0; loopIndex < length; loopIndex++) {
attributes[loopIndex] = (Attr)node.getAttributes().item(loopIndex);
for (int loopIndex = 0; loopIndex < attributes.length; loopIndex++) {
Attr attribute = attributes[loopIndex];
displayStrings[numberDisplayLines] += " ";
displayStrings[numberDisplayLines] += attribute.getNodeName();
displayStrings[numberDisplayLines] += "=\"";
displayStrings[numberDisplayLines] += attribute.getNodeValue();
displayStrings[numberDisplayLines] += "\"";
displayStrings[numberDisplayLines]+=">";
numberDisplayLines++;
NodeList childNodes = node.getChildNodes();
if (childNodes != null) {
length = childNodes.getLength();
indent += " ";
for (int loopIndex = 0; loopIndex < length; loopIndex++ ) {
display(childNodes.item(loopIndex), indent,UpdtRecs);
break;
case Node.CDATA_SECTION_NODE: {
displayStrings[numberDisplayLines] = "";
displayStrings[numberDisplayLines] += "<![CDATA[";
displayStrings[numberDisplayLines] += node.getNodeValue();
displayStrings[numberDisplayLines] += "]]>";
numberDisplayLines++;
break;
case Node.TEXT_NODE: {
displayStrings[numberDisplayLines] = "";
String newText = node.getNodeValue().trim();
if(newText.indexOf("\n") < 0 && newText.length() > 0) {
displayStrings[numberDisplayLines] += newText;
displayStrings[numberDisplayLines] += "\n";
numberDisplayLines++;
break;
case Node.PROCESSING_INSTRUCTION_NODE: {
displayStrings[numberDisplayLines] = "";
displayStrings[numberDisplayLines] += "<?";
displayStrings[numberDisplayLines] += node.getNodeName();
String text = node.getNodeValue();
if (text != null && text.length() > 0) {
displayStrings[numberDisplayLines] += text;
displayStrings[numberDisplayLines] += "?>";
displayStrings[numberDisplayLines] += "\n";
numberDisplayLines++;
break;
if (type == Node.ELEMENT_NODE) {
displayStrings[numberDisplayLines] = indent.substring(0,
indent.length() - 4);
displayStrings[numberDisplayLines] += "</";
displayStrings[numberDisplayLines] += node.getNodeName();
displayStrings[numberDisplayLines] += ">";
displayStrings[numberDisplayLines] += "\n";
numberDisplayLines++;
indent += " ";
public static void main(String args[])
Vector xmlValue = new Vector();
xmlValue.add(0,"Kashif");
xmlValue.add(1,"Qasim");
//displayDocument("NewMediation.xml",xmlValue);
<?xml version="1.0" encoding="UTF-8"?>
<Mediation>
<Task1>
<Source>
<SourceDriver>com.microsoft.jdbc.sqlserver.SQLServerDriver</SourceDriver>
<SourceConnection>jdbc:microsoft:sqlserver://10.2.1.58:1433;DatabaseName=MTCVB_HDS;</SourceConnection>
<SourceUser>sa</SourceUser>
<SourcePassword>sa</SourcePassword>
<Table>
<SourceTable>t_Agent</SourceTable>
<SourceQuery><![CDATA[SELECT SkillTargetID,PersonID,PeripheralID,EnterpriseName,PeripheralNumber,Deleted,TemporaryAgent,AgentStateTrace,ChangeStamp FROM t_Agent where SkillTargetID > {value_1} order by SkillTargetID]]>
</SourceQuery>
<SourceParm BusinessRule="" ColumnName="SKILLTARGETID" ColumnNumber="1" DataType="Numeric" DefaultValue="0" Format="mm/dd/yyyy xx:xx:xx XX">
</SourceParm>
<SourceParm BusinessRule="" ColumnName="PERSONID" ColumnNumber="2" DataType="String" DefaultValue="" Format="">
</SourceParm>
<SourceParm BusinessRule="" ColumnName="PERIPHERALID" ColumnNumber="3" DataType="String" DefaultValue="" Format="">
</SourceParm>
<SourceParm BusinessRule="" ColumnName="ENTERPRISENAME" ColumnNumber="4" DataType="String" DefaultValue="" Format="">
</SourceParm>
<SourceParm BusinessRule="" ColumnName="PERIPHERALNUMBER" ColumnNumber="5" DataType="String" DefaultValue="" Format="">
</SourceParm>
<SourceParm BusinessRule="" ColumnName="DELETED" ColumnNumber="6" DataType="String" DefaultValue="" Format="">
</SourceParm>
<SourceParm BusinessRule="" ColumnName="TEMPORARYAGENT" ColumnNumber="7" DataType="String" DefaultValue="" Format="">
</SourceParm>
<SourceParm BusinessRule="" ColumnName="AGENTSTATETRACE" ColumnNumber="8" DataType="String" DefaultValue="" Format="">
</SourceParm>
<SourceParm BusinessRule="" ColumnName="CHANGESTAMP" ColumnNumber="9" DataType="String" DefaultValue="" Format="">
</SourceParm>
<QueryParm FldName_1="SkillTargetID" FldType_1="Number" value_1="0">
</QueryParm>
</Table>
</Source>
</Task1>
</Mediation>
The QueryParm values are updated thru this code :)
Hope it helps u ...